LibDNS: Remove the 'DNS' prefix from the various type and class names

Since all types and class names live in the DNS namespace, we don't
need to spell it out twice each time.

Userland/Libraries/LibDNS/Name.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Sergey Bugaev <bugaevc@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <AK/String.h>
+
+namespace DNS {
+
+class Name {
+public:
+    Name() = default;
+    Name(String const&);
+
+    static Name parse(u8 const* data, size_t& offset, size_t max_offset, size_t recursion_level = 0);
+
+    size_t serialized_size() const;
+    String const& as_string() const { return m_name; }
+
+    void randomize_case();
+
+    bool operator==(Name const& other) const { return Traits::equals(*this, other); }
+
+    class Traits : public AK::Traits<Name> {
+    public:
+        static unsigned hash(Name const& name);
+        static bool equals(Name const&, Name const&);
+    };
+
+private:
+    String m_name;
+};
+
+OutputStream& operator<<(OutputStream& stream, Name const&);
+
+}
+
+template<>
+struct AK::Formatter<DNS::Name> : Formatter<StringView> {
+    ErrorOr<void> format(FormatBuilder& builder, DNS::Name const& value)
+    {
+        return Formatter<StringView>::format(builder, value.as_string());
+    }
+};